Un estudio exploratorio para testar los sedimentos atrapados por marmitas de erosión en ríos sobre roca como indicadores ambientales (NO Macizo Ibérico)

Palabras clave: ríos sobre roca; formas erosivas; sedimentos; elementos mayoritarios; elementos traza; noroeste de España

Resumen

La capacidad de las marmitas fluviales para atrapar sedimentos junto con el análisis de los mismos para la evaluación ambiental es un tema de investigación poco estudiado en el caso de pequeños ríos sobre roca. El estudio exploratorio que se presenta, desarrollado en un pequeño río sobre roca del interior de Galicia (noroeste de la Península Ibérica), está centrado en esta cuestión. El estudio partió del análisis de las marmitas fluviales inventariadas con el objetivo de identificar las formas adecuadas para el muestreo y la recolección de sedimentos en su interior.  A continuación, se determinó la granulometría, mineralogía y el contenido de elementos mayoritarios y de elementos traza en los sedimentos. Las marmitas fluviales con profundidad máxima vertical desde 25 cm hasta 1 m, localizadas en el sector central y lateral del canal, presentaron las mejores condiciones para el muestreo de sedimentos. En los sedimentos recolectados en seis marmitas predomina el tamaño de grano grueso-medio y la fracción arenosa. El contenido de elementos mayoritarios y traza está relacionado con la naturaleza de los minerales más refractarios de la roca. Mediante una estrategia de muestreo adecuada, teniendo en cuenta las fracciones granulométricas, muestran potencial en el uso de los elementos traza como indicadores ambientales.

Citas

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Publicado
2021-06-21
Sección
Artículos de Investigación